- If x=(-2,-4) and y=(-1,-5), find the vector v=2x-4y and its additive inverse?

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If a+b+c=4, ab+ac+bc=6, and abc=3, what is 1/a + 1/b + 1/c? Can reality itself be programmed by interacting with it - in particular asking questions that lead to where you're directing it to go? Find all solutions to the following system of nonlinear equations.
(x − 2)^2 + y ^2 = 20
(x + 2)^2 + y^ 2 = 20? The silica content of magma greatly affects its viscosity. Magma with a high silica content has a? When the pressure that a gas exerts on a sealed container changes from -atm to 1.80 atm, the temperature changes from 86.0 C to 30.0 C.?